Installation and Operation Instruction for THF Filter and Protective Unit THF 1_ THF 1BS_ General guidelines Due to the fact that most UK building earth circuits are TN-S-systems, special care should be taken when installing a THF system in this country. As with all other THF installations, the device should be fitted in the Neutral conductor, however the following guidelines should be followed: 2247 0191/ 1SCC330001M5803 34 THF 1S1 C THF • THF should be installed in the Neutral conductor at the Transformer Star Point. • In N- conductor in transformer star point: Care should be taken to ensure that no earth/neutral bond exists on the supply (transformer) side of the filter. This may result in a bypass situation causing excessive current to flow via the system earth. • In case of installation in N-conductor of TN-S- system: Prior to installation of THF, resistance measurements must be carried out between the downstream (building) earth & neutral to ensure that no erroneous earth/neutral connection exists other than that intended to achieve a TN-S-system. Such accidental connection could cause excessive current to flow in the system earth. • This Installation and setting instructions for the THF-1S protection unit and brochure THF 1 GB and 2 GB should be followed. THF 1S_
Transcript
Installation and Operation Instruction for THF Filter and Protective Unit THF 1_
THF 1BS_
General guidelines
Due to the fact that most UK building earth circuits are TN-S-systems, special care should be taken when installing a THF system in this country.
As with all other THF installations, the device should be fitted in the Neutral conductor, however the following guidelines should be followed:
2247 0191/ 1SCC330001M5803 34 THF 1S1 C
THF
• THF should be installed in the Neutral conductor at the Transformer Star Point.
• In N- conductor in transformer star point: Care should be taken to ensure that no earth/neutral bond exists on the supply (transformer) side of the filter. This may result in a bypass situation causing excessive current to flow via the system earth.
• In case of installation in N-conductor of TN-S- system: Prior to installation of THF, resistance measurements must be carried out between the downstream (building) earth & neutral to ensure that no erroneous earth/neutral connection exists other than that intended to achieve a TN-S-system. Such accidental connection could cause excessive current to flow in the system earth.
• This Installation and setting instructions for the THF-1S protection unit and brochure THF 1 GB and 2 GB should be followed.
THF 1S_
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Installation and operation instruction for THF filter and protective unit THF 1_
The function of Protective unit (THF1_)The protective unit shall always be used when the THF is installed in the star point on TN-C- and TN-S-circuits. It can also be used in TN-S-system, when THF is installed in N-conductor.
The purpose of the protection unit is:
• to prevent harmful effects of 150/180Hz fault current by measuring the current.• to protect the network against high 50/ 60Hz voltage drop.
• to protect THF against overload.
The function of the protection unitThe protection unit controls the by-pass-contactor ( K1) in case the 50/60Hz or 150/180Hz current exceeds the set level.
The factory settings:
• 150/180 Hz current: 7% of the rated primary current of current transformer ( T1). This current can cause overheating in case of fault in the TN-S-system.• Time settings 0,5 sec.• 50/60Hz current exceeds 50% of the rated primary current of current transformer (T1). This current is a cause of increased unbalance voltage.
Installation and operation instruction for THF filter and protective unit THF 1_
Connection to the network need to be done by authorised and skilled personnel only.
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switch.
3. Care should be taken to ensure that no earth/neutral bond exists on the supply (transformer) side of the filter.
• 150/180 Hz current: 7% of the rated primary current of current transformer ( T1). This current can cause overheating in case of fault in the TN-S-system.• Time settings 0,5 sec.• 50/60Hz current exceeds 50% of the rated primary current of current transformer (T1). This current is a cause of increased unbalance voltage.
Installation and operation instruction for THF filter and protective unit THF 1_
Connection to the network need to be done by authorised and skilled personnel only.
Installation to TN-C-System - THF in the transformer star point
The installation shall be done following the local wiring rules suggesting to work all power off. Prior to installation of THF in the transformer star-point between point A and B following measures must be taken.
1. Measure the fundamental 50/60Hz current in the star point connector conductor. Load balancing is recommended, if the unbalance current exceeds 15% of the rated primary current of the CT.2. Open both the HV-main switch and the LV-main
This may result in a by-pass situation causing exces-sive current to flow via the system earth, heating of the cables and inactivating the THF.
4. Measure the isolation resistance between point A and B to ensure that the resistance between point A and B is high. Re needs to be over 50 kΩ.
Any earthing conductor with lower resistance by-passing the THF between the star point and B might be subject to high third harmonic current, which can cause heating of the cables.
5. Make the earthing in point B.
The installation of THF
6. Before the installation turn the by-pass switch of THF-unit ON.
7. Connect the OUTPUT-terminal to the load side(B).
8. Connect the INPUT-terminal to the line side (A).
9. The PEN-wire shall be earthed after the OUTPUT-terminal only. No earthing is allowed between the transformer star point (N-terminal) and the INPUT-terminal.
10. After the installation turn the by-pass-switch in OFF-position.
11. Check that the THF connection is right by measu-ring the current with THF ON and OFF. In proper installation the filtering effect should be around 90 % and the 150/180 Hz voltage across THF should be 10...45V.
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Installation to TN-S-System - THF in the N-conductor
The installation shall be done following the local wiring rules suggesting to work all power off. Prior to installation of THF on N –conductor between point A and B following measures must be taken.
1. Measure the fundamental 50/60Hz current on the N-conductor. Phase balancing is recommended,if the unbalance current exceeds 15% of the rated primary current of the CT.2. Open the LV-main switch.3. Check that there is no earting bond on the load side between N-conductor after the point B and the earthing system.4. Measure the isolation resistance between point A and B or to ensure that the resistance between point A and B is high. Re needs to be over 50 kΩ.5. Resistance measurements must be carried out between the downstream (building) earth & neutral to ensure that no erroneous earth/neutral connection exists other than that intended to achieve a TN-S-system. Such accidental connection could cause excessive current to flow in the system earth and heating of the
cables.
The installation of THF in the N-conductor
6. Before the installation turn the by-pass switch of THF-unit ON.7. Connect the OUTPUT-terminal to the load side (B).8. Connect the INPUT-terminal to the line side (A).9. The N-conductor of TN-S-system shall be earthed on the line side of THF only. No earthing is allowed between N-terminal and earthing system on the load side of THF (OUTPUT-terminal).10. After the installation turn the by-pass-switch in OFF-position.11. Check that the THF connection is right by measuring the current with THF ON and OFF. In proper installation the filtering effect should be around 90% and the 150/180 Hz voltage across THF should be 10...45V.
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Installation to TN-S-System – THF in the transformer star point
2. Open both the HV- main switch and the LV-main switch.3. Care should be taken to ensure that no earth/neutral bond exists on the supply (transformer) side of the filter. This may result in a by-pass situation causing excessive current to flow via the system earth, heating of the cables and inactivating the filter.4. Measure the isolation resistance between point A and B to ensure that the resistance between point A and B is high. Re needs to be over 50 kΩ. Any earthing conductor with lower resistance by-passing the THF between the star point and B might be subject to high third harmonic current and heating of the cables, and inactivating THF.5. Make the earthing in point B.
The installation shall be done following the local wiring rules suggesting to work all power off. Prior to installation of THF in the transformer star-point between point A and B following measures must be taken.
1. Measure the fundamental 50/60Hz current in the star point connector conductor. Load balancing is recommended, if the unbalance current exceeds 15% of the rated primary current of the CT.
Installation to TN-S-System - THF in the N-conductor
1. Measure the fundamental 50/60Hz current on the N-conductor. Phase balancing is recommended,if the unbalance current exceeds 15% of the rated primary current of the CT.2. Open the LV-main switch.3. Check that there is no earting bond on the load side between N-conductor after the point B and the earthing system.4. Measure the isolation resistance between point A and B or to ensure that the resistance between point A and B is high. Re needs to be over 50 kΩ.5. Resistance measurements must be carried out between the downstream (building) earth & neutral to ensure that no erroneous earth/neutral connection exists other than that intended to achieve a TN-S-system. Such accidental connection could cause excessive current to flow in the system earth and heating of the
cables.
The installation of THF in the N-conductor
6. Before the installation turn the by-pass switch of THF-unit ON.7. Connect the OUTPUT-terminal to the load side (B).8. Connect the INPUT-terminal to the line side (A).9. The N-conductor of TN-S-system shall be earthed on the line side of THF only. No earthing is allowed between N-terminal and earthing system on the load side of THF (OUTPUT-terminal).10. After the installation turn the by-pass-switch in OFF-position.11. Check that the THF connection is right by measuring the current with THF ON and OFF. In proper installation the filtering effect should be around 90% and the 150/180 Hz voltage across THF should be 10...45V.
The installation of THF in the PEN- conductor
6. Before the installation turn the by-pass switch of THF-unit ON.7. Connect the OUTPUT-terminal to the load side (B).8. Connect the INPUT-terminal to the line side (A).9. The PEN-wire shall be earthed after the OUTPUT- terminal only. No earthing is allowed between the transformer star point (N-terminal) and the INPUT- terminal.10. After the installation turn the by-pass-switch in OFF- position.11. Check that the THF connection is right by measuring the current with THF ON and OFF. In proper installation the filtering effect should be around 90 % and the 150/ 180 Hz voltage across THF should be 10...45V.
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The installation shall be done following the local wiring rules suggesting to work all power off. Prior to installation of THF on PEN−conductor between point A and B following measures must be taken.
Installation to TN-C-S-System
THF in the transformer star point - Recommended connecting point
• In PEN- conductor in transformer star point: Care should be taken to ensure that no earth/neutral bond exists on the supply (transformer) side of the filter. This may result in a bypass situation causing excessive currentto flow via the system earth.
Follow the rules described in this instruction- capitel TN-C-system.
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The installation shall be done following the local wiring rules suggesting to work all power off. Prior to installation of THF on PEN−conductor between point A and B following measures must be taken.
Installation to TN-C-S
- THF in N-conductor of the TN-S- part
The installation shall be done following the local wiring rules suggesting to work all power off. Prior to installation of THF on N –conductor between point A and B following measures must be taken.
Prior to installation of THF in N-conductor of one of the TN-S-parts, resistance measurements must be carried out between the downstream (building) earth & neutral to ensure that no erroneous earth/neutral connection exists other than that intended to achieve a TN-S-system. Such accidental connection could cause excessive current to flow in the system earth and overheating of cables.
The procedure is the same as in the TN-S-system described in this instruction.
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Before the connection to the network
1. Check that the connection have been made properly.2. Check that no foreign parts are left during installation in the units.3. Ensure the following values are set in the protective unit (see table).4. Ensure the by-pass-switch is in OFF position.5. Switch ON the control voltage in the protective unit.6. Carry out a TEST-procedure (see table in page 9). If the indicator lights are according to the table in page 9, the protection unit is working correctly and the THF-filter can be switched on the network.
Current transformer KORE06F1600/1THFRelay settings as factory settings in the above table:
Amp-meter is connected in the secondary circuit of the T1 Current transformer. It is equip-ped with %-scale where 100% indication corresponds the nominal primary current of T1 Current transformer. When the THF-filter is connected the meter indicates mainly the 50/60Hz unbalance current which flows in the N/PEN- wire. When the THF-filter is bypassed the meter indicates mainly the 3rd harmonic current.
2. The indicator light functions
3. Resetting of a protective unit
4. The indicator light functions in Test-actions
1. Find out the reason why a protective unit has been activated and correct the fault. - The reason for an unbalance current may be a blown fuse in main circuit.2. Check by ‘Test’-action that a protective unit is working properly.3. Push ‘Reset’ -button. - If the protective unit is activated again the reason has not been sorted out.
Note!
Check that when the load is running the ‘’OK’’- light is ON.Otherwise see the checklist in page 9.
Example:
1. Amp-meter
In all other indicator light combinations, by-pass a THF-unit manually, by connectingINPUT- and OUTPUT- terminals! Contact to a local ABB representative!
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